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Share-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Share-Based Compensation [Abstract] |
Schedule of the Allocation of Performance Shares Between Total Shareholder Return and Earnings per Share |
|  | 2018 |  | 2017 |  | 2016 |
Total shareholder return |  | 55 | % | 55 | % | 55 | %
Earnings per share |  | 45 | % | 45 | % | 45 | %
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award | A summary of the status of the Company’s non-vested share units as of December 31, 2018 and the changes during the year then ended, are presented below:
|  |  |  |  |  |  |  |  |  | Performance-based
|  |  |  |  | Time-based awards |  |  |  |  | awards
|  |  |  | Weighted- |  |  |  | Weighted-
|  | Common |  | average grant |  | Common |  | average grant
|  | Shares |  | date fair value |  | Shares |  | date fair value
Non-vested as of December 31, 2017 |  | 443,152 |  | $ | 15.01 |  | 744,188 |  | $ | 14.92
Granted |  | 176,116 |  | $ | 24.69 |  | 215,490 |  | $ | 29.41
Vested |  | (182,451) |  | $ | 13.21 |  | (284,462) |  | $ | 11.19
Forfeited or cancelled |  | (16,821) |  | $ | 19.99 |  | (46,996) |  | $ | 17.13
Non-vested as of December 31, 2018 |  | 419,996 |  | $ | 19.64 |  | 628,220 |  | $ | 21.41
A summary of the status of the Company’s non-vested share units as of December 31, 2017 and the changes during the year then ended, are presented below:
|  |  |  | Time-based awards Weighted- |  |  |  | Performance-based awards Weighted-
|  | Common |  | average grant |  | Common |  | average grant
|  | Shares |  | date fair value |  | Shares |  | date fair value
Non-vested as of December 31, 2016 |  | 612,037 |  | $ | 12.32 |  | 825,140 |  | $ | 12.14
Granted |  | 177,664 |  | $ | 18.73 |  | 217,495 |  | $ | 21.54
Vested |  | (310,207) |  | $ | 12.05 |  | (165,783) |  | $ | 11.72
Forfeited or cancelled |  | (36,342) |  | $ | 13.23 |  | (132,664) |  | $ | 12.52
Non-vested as of December 31, 2017 |  | 443,152 |  | $ | 15.01 |  | 744,188 |  | $ | 14.92

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- Definition Schedule of the Allocation of Performance Shares Between Total Shareholder Return and Earnings per Share [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 + Details
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